Hello, looking for info before setting up TrueNAS as a VM un Unraid

[Eddyall]

Hello, I'll soon be trying to install an instance of TrueNAS Core as a VM on my Unraid server after I replace some hard drives in it. I understand it's not the best but I'm just trying it out but I will be using it to backup some stuff for my PCs and things that would be more awkward to get again for my server which I mostly use to host my DVD/BluRay collection.

I'm mostly checking in with people to see what would be the sensible option with the gear I have but also gather some more ideas for projects. My plan is current to have 4-6 cores, 20-24GB and an HBA with 4x4TB drives for the VM. I'm planning on:

• Setting backup for the Home folder of my main PC using Mint (might be switching OS a couple time, trying different distros in VMs ATM)
• Backing up some of the shares on my server on a schedule, like VMs, docker config files and image/pdf/videos
• Remapping a Postgres docker to use TrueNAS to store the database there for two Szurubooru instance (image board engine/website) that I use for images and music clip respectively.

Couple questions I have

1. How much RAM/CPU cores should I assign to the VM to not starve it nor over provisioning it for the average workload?
2. Should I assign it it's own NIC? That wouldn't be a problem for me part wise because I could put in a X540-T2 (2x10Gbps) but that would require double checking the PCIe lane layout.
3. I have a 1TB SATA3 SSD, is that worth passing or would it not be relevant much?
4. How does TrueNAS react to power outage? Unraid I know how it reacts so just want to make sure what to expect with TrueNAS since it's mostly working in the RAM. I know I should get an UPS but short story waiting to move, I FULLY indent to do when I get a place and know it's layout.
5. Somewhat related, my HBA has an external SFF8088 port, are there any small scale disk shelf that exist or they're all for dozen+ of drives?

Feel free to poke me for more info/clarification and thank you for any help.

Show : Unraid machine

Motherboard: Supermicro X10DRI-T
CPUs: Intel Xeon E5-2690 v3
RAM: 4x16GB at 2133MHz per core
HBA: LSI SAS2308-4i4e
GPU: nVidia GTX1650 Super
HDD: Currently 4x4TB+3x8TB, switching the 4x4TB with 2x12TB
SSD: Couple NVMEs on a ASUS HYPER M.2 splitter

 

[Patrick M. Hausen]

You must passthrough an entire HBA via PCIe passthrough to TrueNAS. Using virtual disks for storage or "disk passthrough" won't work. For the NIC you can go virtual or passthrough - depends on if you have a spare NIC.
PCIe passthrough is known to work best with ESXi so you are definitely on highly experimental territory, here.
Using only a single disk is also highly discouraged. You should have some redundancy in your storage pool.
TrueNAS writes transaction groups to disk every 5 seconds by default. A sudden power outage should lose not more than a couple of seconds of data in flight.